Epidural: Procedure, Side Effects, Risks & How Long It Lasts
Published on: Aug 07, 2026
TABLE OF CONTENTS
Epidural anaesthesia is the most widely used labour pain relief worldwide. It transforms hours of unmanaged contraction pain into a controlled, tolerable experience without affecting consciousness. Also used for lower-body surgery and chronic back pain, it carries questions and concerns that are best answered before the labour room.
What Is an Epidural?
An epidural is an injection of local anaesthetic (and sometimes a painkiller opioid) into the epidural space: the narrow channel just outside the membrane surrounding the spinal cord. Drugs spread along spinal nerves as they exit the cord, blocking pain signals before they reach the brain. The needle does not enter the spinal cord or the fluid-filled sac (dura mater) around it. A thin catheter is threaded through the needle and left in place; drugs are then delivered continuously or on demand through it, allowing dose adjustments throughout labour.
Why Is an Epidural Used During Labour and Delivery
Labour contractions produce intense pain ranging from uterine contractions to cervical stretching and nerve pressure. Pain signals travel along the lower thoracic and lumbar (lower back) spinal nerves. An epidural at the lumbar level blocks these pathways, reducing or eliminating contraction pain while the mother remains conscious. Beyond labour pain, it is chosen for:
Prolonged or difficult labour - uncontrolled pain causes exhaustion that compromises the pushing stage
Caesarean section - an epidural already in place is rapidly topped up for full surgical anaesthesia, avoiding general anaesthesia
Medical conditions (high blood pressure, cardiac conditions) where the cardiovascular stress of uncontrolled pain poses additional risk
Instrumental deliveries (forceps or ventouse).
How the Epidural Procedure Is Performed
An anaesthetist performs the procedure. The mother sits back rounded into a C-shape, or lies curled on her side - both positions open the lumbar vertebrae (lower back bones), giving the needle access. Antiseptic is applied and a small dose of local anaesthetic numbs the skin first. The epidural needle is then guided into the epidural space; a catheter is threaded through, the needle removed, and the catheter taped to the back. The initial drug dose produces warmth and then numbness in the lower body within 10–20 minutes. The procedure takes 10–15 minutes and is ideally performed between contractions.
Duration and Effectiveness of an Epidural
Once established, the epidural provides continuous pain relief for as long as labour lasts. This happens because medication flows through the catheter, not a single injection. Most modern units use PCEA (patient-controlled epidural analgesia), letting the mother press a button for an extra burst within safe pre-set limits. After delivery, the catheter is removed and the effect wears off over 1–2 hours. Residual leg heaviness may last up to 4 hours, after which full sensation and mobility return.
Benefits of Epidural Pain Relief During Childbirth
Benefits are:
Most reliable pain relief in labour and superior to opioid injections.
Preserved consciousness - unlike general anaesthesia, the mother remains fully awake and able to participate
Reduced stress response - uncontrolled pain releases adrenaline, which can reduce blood flow to the uterus; epidural analgesia blunts this
Flexible dosing - the catheter allows dose adjustments throughout labour
Rapid conversion for caesarean section - the catheter is topped up with a stronger drug, faster and safer than placing new anaesthesia
Rest in prolonged labour - effective pain control allows sleep, preserving energy for pushing
Side Effects and Risks of Epidural Anaesthesia
Epidurals are safe for the majority of women. Side effects range from minor to rare but serious. Common effects:
Low blood pressure (hypotension) in some of the women
Itching (pruritus)
Leg heaviness and reduced sensation
Shivering and urinary retention.
Less common:
Incomplete pain relief
Post-dural puncture headache
Injection site backache - mild soreness lasting a few days.
Rare but serious:
Nerve damage
Epidural infection (abscess) or haematoma (blood collection)
Accidental intrathecal injection (into the spinal fluid rather than the epidural space) causes a sudden dense block requiring immediate anaesthetic management.
Who Should Avoid an Epidural?
People with specific conditions should avoid it:
Bleeding disorders or low platelet count (thrombocytopaenia)
Anticoagulant medication (minimum time intervals between the last dose and epidural placement are specified by guidelines)
Active infection at the injection site, or systemic infection (sepsis)
Severe spinal deformity or previous complex spinal surgery distorting the epidural space.
FAQs
Is an epidural painful during administration?
The initial local anaesthetic injection (a small sting) is the most felt part. The epidural needle, placed after the skin is numb, is generally described as pressure rather than pain. Most women find the procedure far less uncomfortable than a contraction.
How quickly does an epidural start working during labour?
Warmth and reduced contraction intensity begin within 5-10 minutes; full pain relief within 20 minutes. If pain persists beyond 30 minutes, the anaesthetist should assess the catheter position.
Can a person stay awake after receiving an epidural?
Yes remaining awake is one of the central advantages over general anaesthesia. The drugs block pain below the waist and they do not affect consciousness or breathing. The mother is fully alert, can speak and remains aware throughout the birth.
Does an epidural completely remove labour pain?
In most cases, yes but in some cases it produces incomplete or uneven relief. Adjusting the catheter or drug dose usually corrects this. The goal is not complete numbness but effective analgesia - pain reduced enough to remain tolerable while still allowing the mother to feel the urge to push.
Can an epidural slow down the labour process?
Epidurals are associated with a slightly longer pushing phase (averaging 15-20 minutes) but do not increase the overall caesarean section rate. Reducing the dose as the pushing stage approaches helps maintain enough sensation for effective effort.
Are headaches common after an epidural?
Post-dural puncture headache is caused by accidental puncture of the dura mater (membrane around the spinal cord). The headache is severe and positional: much worse upright, better lying flat. It develops 24-48 hours after the procedure. Treatment starts with hydration, caffeine, and pain relief; a blood patch (injecting the patient's own blood at the puncture site) resolves persistent cases.
Can an epidural temporarily affect leg movement?
Yes leg weakness and reduced sensation are expected effects of the local anaesthetic, not complications. The degree varies: some women can bend their knees with support while others feel very heavy. This resolves fully within 1-4 hours of the last dose. Walking is usually safe once sensation and strength return.
Is epidural anaesthesia safe for both mother and baby?
Epidural anaesthesia is safe for both mother and baby. The drugs remain largely within the epidural space. The amount crossing the placenta to the baby is very small. Epidurals do not increase foetal distress risk.
Can someone choose not to have an epidural during childbirth?
Absolutely, this is entirely the mother's decision. Alternatives include entonox (gas and air), opioid injections, TENS (transcutaneous electrical nerve stimulation), water immersion, breathing techniques, and movement. None matches the pain relief an epidural provides, but all are valid choices that align with different values and birth plans.
How long does numbness last after an epidural wears off?
Once the catheter is removed, the local anaesthetic is metabolised over 1-2 hours. Residual leg heaviness may last up to 4 hours. Most women can stand and walk with support within 2-4 hours of discontinuation. Full sensation returns completely and epidurals do not cause permanent numbness.
